3D Stacked Area Chart

This example demonstrates creating a stacked area chart with 3D effects.

The key features demonstrated in this example are:

Add a stacked area layer using XYChart.addAreaLayer2 with the Stack predefined constant.
Add multiple data sets to the area layer using Layer.addDataSet.
Add a legend to the chart using BaseChart.addLegend
Add a title to the y-axis using Axis.setTitle, and draw the title upright (instead of rotated 90 degrees) using TextBox.setFontAngle. Note that the title can contain multiple lines using line break characters.

The following is the command line version of the code in "cppdemo/threedstackarea". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the area chart
    double data0[] = {42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70,
        76, 63, 67, 75, 64, 51};
    const int data0_size = (int)(sizeof(data0)/sizeof(*data0));
    double data1[] = {50, 45, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73,
        77, 84, 82, 80, 84, 89};
    const int data1_size = (int)(sizeof(data1)/sizeof(*data1));
    double data2[] = {61, 79, 85, 66, 53, 39, 24, 21, 37, 56, 37, 22, 21, 33, 13, 17, 4, 23, 16, 25,
        9, 10, 5, 7, 16};
    const int data2_size = (int)(sizeof(data2)/sizeof(*data2));
    const char* labels[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
        "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a XYChart object of size 500 x 300 pixels
    XYChart* c = new XYChart(500, 300);

    // Set the plotarea at (90, 30) and of size 300 x 240 pixels.
    c->setPlotArea(90, 30, 300, 240);

    // Add a legend box at (405, 100)
    c->addLegend(405, 100);

    // Add a title to the chart
    c->addTitle("Daily System Load");

    // Add a title to the y axis. Draw the title upright (font angle = 0)
    c->yAxis()->setTitle("Database\nQueries\n(per sec)")->setFontAngle(0);

    // Set the labels on the x axis.
    c->xAxis()->setLabels(StringArray(labels, labels_size));

    // Display 1 out of 2 labels on the x-axis. Show minor ticks for remaining labels.
    c->xAxis()->setLabelStep(2, 1);

    // Add an area layer
    AreaLayer* layer = c->addAreaLayer();

    // Draw the area layer in 3D
    layer->set3D();

    // Add the three data sets to the area layer
    layer->addDataSet(DoubleArray(data0, data0_size), -1, "Server # 1");
    layer->addDataSet(DoubleArray(data1, data1_size), -1, "Server # 2");
    layer->addDataSet(DoubleArray(data2, data2_size), -1, "Server # 3");

    // Output the chart
    c->makeChart("threedstackarea.png");

    //free up resources
    delete c;

    return 0;
}